William STEWART family

I'm looking for any information on the family and descendants of William STEWART. William was born in 1840 in VA. He was the son of John STEWART & Elizabeth KEISER. William migrated to San Luis Obispo Co., CA, probably to the city of San Luis Obispo as a young man.He contacted his family in VA to let them know he was well and that he had married (Wife's name unknown) and now had 2 sons, Allen & William.I would appreciate any leads on finding this family & I have lots of STEWART information to share.